Halogen-Modified Porous Solid Electrolyte for Higher Ionic Conductivity

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Solution Overview

Problem

Existing solid electrolytes in all-solid-state lithium secondary batteries have low ionic conductivity due to weak adsorption and orientation of molecules in the ionic liquid to the surface of SiO2, limiting their effectiveness.

Innovation Solution

A solid electrolyte with a porous dielectric having interconnected pores modified by a functional group containing a halogen atom, filled with a metal salt and ionic compound, enhancing ion adsorption and orientation through high electronegativity, and incorporating a polarization layer to improve ionic conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If SiO2 is used as the porous dielectric material, then the solid electrolyte structure is formed, but the ionic conductivity is low due to weak adsorption and orientation of ionic liquid molecules to the SiO2 surface

Engineering Contradiction:

Improveionic conductivityVSAvoidmolecular adsorption strength

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent modifies the surface properties of SiO2 by introducing functional groups containing halogen atoms (Cl, Br, I). This chemical modification changes the surface parameters such as electronegativity and surface energy, thereby enhancing the adsorption capability for ionic liquid molecules and improving ionic conductivity without changing the fundamental SiO2 structure

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite structure where SiO2 porous dielectric is combined with functional groups containing halogen atoms on its inner surface. This composite approach leverages the porous structure of SiO2 for ion transport pathways while the halogen-containing functional groups provide enhanced adsorption sites, resulting in improved overall ionic conductivity

Inventive Principle:

Principle #40Composite materials

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The modified solid electrolyte exhibits high ionic conductivity, maintaining performance in low-humidity environments and supporting efficient lithium-ion battery operation.

Implementation Method 1

inner surfaces of the plurality of pores of the porous dielectric are at least partially modified by a functional group containing a halogen atom

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentEP3780163B1Solid electrolyte, electrode, power storage element, and method for producing solid electrolyte

Publication Date: 2025.09.03 INTERUNIVERSITAIR MICRO ELECTRONICS CENT (IMEC VZW)

Figure 1A~1B
Figure 1C~2
Figure 3~4

AI summary

A solid electrolyte (10) of the present disclosure includes: a porous dielectric (11) having a plurality of pores (12) interconnected mutually; and an electrolyte (13) including a metal salt and at least one selected from the group consisting of an ionic compound and a bipolar compound and at least partially filling an interior of the plurality of pores (12). Inner surfaces of the plurality of pores (12) of the porous dielectric (11) are at least partially modified by a functional group containing a halogen atom.